Definition: You are given a question on college physics. You are also given 4 answer options (associated with "A", "B", "C", "D"), out of which only one is correct. You need to answer the question by selecting the correct option. You should only answer with the choice letter, not the whole answer.
Input: In the diamond structure of elemental carbon, the nearest neighbors of each C atom lie at the corners of a
(A)square (B)hexagon (C)cube (D)tetrahedron

D